https://devzone.nordicsemi.com/f/nordic-q-a/20073/building-the-old-insecure-bootloader-under-sdk-12Can someone tell me the best way to build the old bootloader under SDK 12. Looking in the examples, in SDK12, there is now only the bootloader_secure example SDK 11 has the old version, but I&#39;m not sure if I can use it with SDK12 BTW. I willen-USTelligent Community 13Wed, 01 Mar 2017 19:50:28 GMThttps://devzone.nordicsemi.com/thread/78148?ContentTypeID=1Wed, 01 Mar 2017 19:50:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:17aa8826-4a22-497e-b0aa-a2bde5ec42f6Roger Clark<p>Thanks</p> <p>I have started building the secure bootloader, and I will persevere with it for a while, but its good to know, I can go back to the old version if necessary</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/78147?ContentTypeID=1Wed, 01 Mar 2017 11:52:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9c88a0af-ce0f-4fc7-91d1-f02f3d0cf467Hung Bui<p>I don&#39;t see any problem building the old bootloader in SDK v12. You just need to copy all the files missing on SDK v12 from SDK v11.</p> <p>If you use the same Softdevice, then the bootloader compiled on SDK v11 should also work with application compiled on SDK v12.</p> <p>Note that the secure bootloader from SDK v12 is not backward compatible with the legacy bootloader. For future proof, i would suggest you to use the new bootloader instead of the old one.</p><div style="clear:both;"></div>